2665888656 has 20 divisors (see below), whose sum is σ = 6886879152. Its totient is φ = 888629536.

The previous prime is 2665888649. The next prime is 2665888691. The reversal of 2665888656 is 6568885662.

It is a self number, because there is not a number n which added to its sum of digits gives 2665888656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27769626 + ... + 27769721.

Almost surely, 2^2665888656 is an apocalyptic number.

It is an amenable number.

2665888656 is an abundant number, since it is smaller than the sum of its proper divisors (4220990496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2665888656 is a wasteful number, since it uses less digits than its factorization.

2665888656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55539358 (or 55539352 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 60.

The square root of 2665888656 is about 51632.2443440143. The cubic root of 2665888656 is about 1386.5876749669.

The spelling of 2665888656 in words is "two billion, six hundred sixty-five million, eight hundred eighty-eight thousand, six hundred fifty-six".